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Re: [Phys-l] Transparency

On Oct 12, 2008, at 6:57 PM, Brian Whatcott wrote:
. . . This old paper in Phys Rev A 7 mentions an analogous effect,
the laser etched tracks in glasses and polymers.


1) The second author is one of the three people who developed track detectors at GE (first based on mica and later on glasses and other materials).

2) But I have a difficulty with the first sentence: "Self-focused laser filament tracks in various glasses and polymers were chemically etched . . ." They probably wanted to say that "filament tracks, created by a laser beam, were etched . . . " It is the "self-focused" part that confuses me. It probably refers to a laser beam, not to its track. How can a beam be "self-focused" ? It can be focused by a mirror or a lens. What am I missing?

Ludwik Kowalski, a retired physics teacher
5 Horizon Road, Apt. 2702, Fort Lee, NJ, 07024, USA
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